Back-end developer

Who we are

Kassavirtanen Oy is a growing invoicing service company that designs and develops its own systems, websites, and digital services for businesses. We operate from a modern office in the heart of Helsinkis Kamppi district, where teamwork and open communication are at the core of everything we do.

We focus on high-quality code, long-term development, and understanding our clients' businesses. You will have the opportunity to work on meaningful projects that matter to us and our clients.

Your role with us

We are now looking for a Back-End Developer who is passionate about building scalable and efficient back-end systems.

You will work as part of our development team, designing and implementing back-end services and APIs that power both our own systems and custom web services for our clients. In collaboration with front-end developers and designers, you will help build powerful solutions that provide smooth and seamless user experiences.

Technologies we use:

C# / .NET – for back-end development

SQL – working with databases and integrations

JavaScript – basic knowledge for handling API integration and client-side logic

REST APIs – building and maintaining APIs for web services and systems

Familiarity with cloud platforms (Azure, AWS) and DevOps practices is a plus

What we expect from you:

Previous experience in back-end development (at least 2 years)

Strong knowledge of C# / .NET and SQL databases

Experience with designing and building REST APIs

Ability to write clean, efficient, and maintainable code

Experience working with version control (Git)

Understanding of application architecture and scalability

Teamwork skills and a willingness to learn

Fluent in Finnish or English

What we offer you:

Interesting projects with the opportunity to influence their implementation

A supportive work environment and colleagues who will help you grow

A modern workspace in a cozy office in the heart of Kamppi

A competitive salary and excellent employee benefits

Interested?

We review applications and conduct interviews throughout the application period, so we encourage you to apply as soon as possible by sending us your cover letter, CV, and salary expectation.

You are also welcome to send us an open application, as we are always interested in hearing from talented people. Please remember to indicate in your application which position you are applying for.